Looking for motivation to practice morse code [BenB] built this morse code keyboard. It uses USB and is recognized as a standard keyboard thanks to the V-USB stack running on the ATmega168. The project is rounded out with a clean look thanks to the chewing gum container that serves as an enclosure.
His design is simple enough that any morse key you have on hand can be used. You could even adapt that glove coder you built a couple of years back.